6‐3: RGB Organic Electroluminescent Devices with High Color Purity and Directionality

We are introducing an innovative organic semiconductor electroluminescent device capable of emitting red, green or blue light (RGB) with high directionality with divergence angles of 0.7° (red), 0.8° (green) and 1.5° (blue), and high color purity with spectral full‐width at half‐maximum (FWHM) of 1.9 nm (red), 1.6 nm (green) and 1.7 nm (blue). This achievement was realized through design techniques aimed at enhancing gain via meticulous recombination zone control and complemented by the reduction of the optical losses. These results demonstrate the simultaneous achievement of a narrow spectrum and high directionality in RGB organic electroluminescent devices. Our ongoing focus is on further improving these specifications to advance toward a fully functional RGB microdisplay for augmented reality devices.